Pliers.



E. STEAD.

.PUERS.

APPLICATION FILED MAR. 31. I916.

By v I V a %2 W I I HVTQQNEY Patented May 8, 1917.

ERNEST STEAD, 0F BINGHAMTON, NEW YORK.

PLIERS.

mean

Specification of Letters Patent.

Patented May 8, 11917.

Application filed March 31, 1916. Serial No. 87,981.

To all whom it may concern:

Be it known that 1, Ennnsr STEAD, a citizen of the United States ofAmerica, and resident of Binghamton, in the county of Broome, in theState of New York, have invented new and useful Improvements in Fliers,of which the following, taken in connection with the accompanyingdrawings, is a full, clear, and exact description.

This invention relates to certain improvements in pliers forreconstructing the lensclampin ears of lens-mountings in the man ner setforth in my pending application, Serial No, 87,980, filed March 31, 1916, and contemplates the use of three cooperative pressing elements ordies consisting preferably of the main jaws of the pliers and anintermediate relatively movable or floating jaw or die, all constructedand arranged for the purpose of reconstructing each set of lens-clampingears to conform to the thickness and contour of toric and other curvedlenses which they are adapted to receive.

In other words, I have sought to provide a simple, efficient and easilymanipulated device for imparting the desired spacing and curvature tothe lens-clamping ears in a single operation so that the lenses may beclamped in their mountings with greater firmness and less liability ofbreakage or stripping the threads of the clamping screws than hasheretofore been practised.

Another object is to provide means whereby the intermediate or floatingjaw or die may be easily and quickly removed or replaced by dies ofdifferent curvatures.

Other objects and uses relating to specific parts of the pliers will bebrought out in the following description.

In the drawings Figure 1 is a side elevation of a pair of pliersembodying the features of my inven tion, the dotted lines showing theopen position of one of the jaws for removing or replacing theintermediate jaw, also shown by dotted lines as being removed orreplaced.

Fig. 2 is an enlarged face view of the jaws of the pliers in theoperation of reconstructing a pair of lens-clamping ears on the nosepiece or bridge which is also shown in top plan, portions of the plierhandles being broken away.

Fig. 3 is an enlarged detail sectional view taken on line 3-8, Fig. 1.

Fig. 4: is a perspective view of one of the intermediate jaws or diesadapted to be interposed between the main jaws of the pliers.

Fig. 5 is an enlarged face view of a slightly modified form of plierjaws for reconstructing the ears of a mounting to fit double concavelenses.

The pliers illustrated in Figs. 1, 2 and 3 are adapted forreconstructing the clamping ears of lens-mountings for receiving toricor other concavo-convex lenses and comprises a pair of main jaws or dies1 and 2- and an intermediate floating jaw or die 3-, the bases of themain jaws 1 and 2 being crossed and pivotally connected at I l andprovided with suitable handles- 5 by which the jaws may be convenientlyclosed and opened upon and from a set of lens-clamping ears, as a, of alensinounting A, as shown in Fig. 2.

The inner face of the main jaw lis conveXed longitudinally to conform tothe contour of the concave side of a lens which is to be fitted in themounting A., the inner face of the main jaw 2- being concavedlongitudinally to correspond to the convex contour of the same lens.

The jaws 2-2 and 3 are preferably of substantially the same width, theintermediate jaw or die 3 being elongated in the direction of length ofthe main jaws '2 and 3 and the active portion thereof is ofsubstantially the same thickness and lengthwise curvature as the lenswhich is to be mounted.

That is, the face of the intermediate jaw adjacent to the main jaw 2 iscurved longitudinally to correspond to the curvature of the convex sideof a lens, while the major portion of the opposite face adjacent to thejaw 1 is curved longitudinally to correspond to the curvature of theconcave side of a lens.

This intermediate jaw or die 3' is movable toward and from the innerfaces of both of the main jaws 1 and -2-, but is normally held againstendwise or lateral movement by a guide arm 6 which is pivoted at 7- tothe jaw 1- and extends through guide slots or openings -8 and 9- in thejaws -8 and 2-, respectively.

The guide arm 6 is curved concentric with the axis of the pivot -4: ofthe jaws and is of sufficient length to extend across the interveningspace between the main jaws during the limited opening movement v spondsto the normal width of the space between the ears, as a of the mounting-A- and is, therefore, thicker than the lens which is to be mountedbetween said ears, thus forming a lateral projection 10 on one side onlyfacing the main jaw -1 and extending partially across the correspondinend of said main jaw when the jaws are c osed.

That is, the projection -10 is wholly beyond the outer end of the mainaw 1- so that when the jaws are closed tightly upon a set of the ears-a, the latter will be made to conform to the contours of the oppositefaces of the intermediate jaw and also the projection 10 thereon, thusproducing a sharp bond, as a, at the base of the ear -a which isinterposed between the jaws 1 and 3.

In this manner the major portions of the ears -aare spaced andreconstructed to conform to the thickness and curvature of the portionsof the lens which they are adapted to engage, thus producing maximumareas of close contact between said ears and lens and permitting theears to be tightly clamped upon the lens by the screw without liabilityof breaking such lens or stripping the threads of the screw.

Owing to the fact that only a relatively small portion of the outer endof the intermediate jaw or die is used at one time, it is possible toconstruct both ends of such jaw with the same or different projections10 and witi the same or different longitudinal curved surfaces, eitherof which may be used by simply reversing the jaw, and in Fig. f I haveshown such a jaw as having its opposite ends provided with theprojections 10, although the longitudinal curved surfaces of both endsare, in this instance, similar.

In Fig. 5, l have shown a similar device for reconstructing the ears oflens-mountings for receiving double concave lenses in which the innerfaces of both of the jaws 1 and 2 are convexed longitudinally, while theopposite faces of the major portion of the intermediate jaw 3- areconcavcd and terminate in opposite lateral projec tiens -10 for the samepurpose as those previously described.

In the construction shown in Figs. 1, 2 and 3 for reconstructing thelens-clamping ears for receiving toric lenses, the aw -2 is extendedslightly beyond the corresponding end of the intermediate jaw 8 so toengage the entire length of the adjacent ear -a, thereby assuring a moreaccurate formation of said ear, and at the same time assisting in theformation of the sharp bend -a.

What I claim is In a pair of pliers, the combination with a pair of mainjaws having longitudinally curved gripping faces, of an intermediate jawhaving opposite longitudinally curved gripping faces and provided with araised transverse rib on one of said faces at a point slightly beyondthe end face of the cooperative main jaw.

In witness whereof I have hereunto set my hand this 28th day of March,1916.

ERNEST STEAD.

Witness H. E. CHASE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. 0.

